George
1 George's Secret Key to the Universe (2007) (with Stephen Hawking)
2 George's Cosmic Treasure Hunt (2009) (with Stephen Hawking)
3 George and the Big Bang (2011) (with Stephen Hawking)
4 George and the Unbreakable Code (2014) (with Stephen Hawking)
5 George and the Blue Moon (2016) (with Stephen Hawking)
6 George and the Ship of Time (2018)
2 George's Cosmic Treasure Hunt (2009) (with Stephen Hawking)
3 George and the Big Bang (2011) (with Stephen Hawking)
4 George and the Unbreakable Code (2014) (with Stephen Hawking)
5 George and the Blue Moon (2016) (with Stephen Hawking)
6 George and the Ship of Time (2018)
Omnibus editions
George's Secret Key Boxed Set (2016) (with Stephen Hawking)
George's Secret Key Collection Books 1-4 (2016) (with Stephen Hawking)
George's Secret Key Collection: Books 1-6 (2020) (with Stephen Hawking)
George's Secret Key Collection Books 1-4 (2016) (with Stephen Hawking)
George's Secret Key Collection: Books 1-6 (2020) (with Stephen Hawking)